Most of my inside jokes are from "The Battle of the Giant Death Semi", in which he had made a semi truck with around 6-7 trailers covered in death implements. Not to be outdone, I took a soccer bus and decked it out in similar fashion. This became a staple of all our battles, as the giant death vehicles are now seen in just about all of our battles. Thus, the "Semi Death" inside joke was born.
On one of my trailers, I covered it in crazed indian raiders, who jumped aboard the back trailer and wreaked havoc on his men. In a last ditch attempt to stop my carnage, he detonated his artillery and all its ammo, detaching the trailer from his truck, leaving the indians behind. The Indians then jumped off, climbed over rubble for a few turns, and finally got the opportunity to jump off and land on the trailers again. Thus, the phrase "It's raining indians!" became yet another inside joke.
Then, my pirate biker hero attempted to speed along the bus, but only ended up killing the engine for a few turns. Thankfully, one minifig was dedicated enough to try and push the car along. We named the minifig Moe and called that turn "Moe's Bad Date".

Recently, me and my brother have been playing, and everytime I use spider-man as my hero, he always uses his heroic actions to web-yank his own soldiers right into the enemy. It usually ends up with them getting cut up by Jedi knights.